Most People Don't Know How Bikes Work
Veritasium7 HN recommenders · recommended in 4 months, 2021–2025
explainer · general · evergreen · 2021–2025 on HN
Veritasium explains why bicycles are stable, arguing that gyroscopic effects are not the answer. The video shows countersteering and an experiment where riders blocked from steering the opposite way cannot turn.
HN links it in threads on bikes, countersteering and control systems as the clearest demonstration of how bikes actually steer and balance.
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12 comments from Hacker News
You will love the interesting video, "Most People Don't Know How Bikes Work" by Veritasium - ▶ this video
> You only think you understand how a bicycle works, until you learn to ride one. I realize this is just for motivation in a subtitle, but people generally don't grasp how bicycles work, even after having ridden one. Veritasium has a quite good video on the subject: ▶ this video
Here's a good video showing how a bike actually works, and the relation between steering and leaning: ▶ this video
Beautiful article. There's a similar neat video, "Most People Don't Know How Bikes Work", where they fix the steering so the handlebars can only be turned left, and people then aren't able to turn left. ▶ this video
Beautifully illustrated and brilliantly explained. Derek Muller (Veritasium) on YouTube has a related video diving into the mechanics of bicycle riding. It shows what happens if you prevent the rider from performing the countersteer before leaning into a turn [1]. [1]: ▶ this video
Veritasium did a video where they stopped him from counter-steering and couldn't steer anymore. ▶ this video He might be wrong, and just didn't know enough, but he is usually researching his videos very well and I would be surprised for him to be wrong about this.
Indeed. I like this clip where they show bike steering to the left, without its front wheel ever going to the right side of its original path, by only leaning and no countersteering. ▶ this video
More on the physics of how bikes work, Derek Muller from Veritasium demonstrated what happens if you lock the steering of a bike: ▶ this video
No that's not true. A bike just naturally steers into its fall. Veritasium made a video about it: ▶ this video
The gyroscopic effect is not necessary, and it has been demonstrated both in reality and in simulation [0]. The central principle behind why a bicycle is self balancing while in motion is the fact that it self-steers in the same direction that it is leaning, which counteracts the fall [0][1]. [0] link [1] ▶ this video
related content: Would it even be possible to turn left if steering right would be blocked? "Most People Don't Know How Bikes Work" ▶ this video
You can't turn a bicycle or motorbike without counter-steering, so these people are just not turning their bikes? It's not possible to not countersteer as the bike would lean to the wrong direction and you'd turn the wrong way (since you'd have been initiating a countersteer, afterall). Are you seeing people just manhandle the bars the wrong way in emergencies? I could believe that. ▶ this video